✓
Growing IR64 in Zone 3b
Oryza sativa
✓ Well Suited for Zone 3b
Score: 70/100
🌡️ USDA Hardiness Zone 3b
Cold Continental
USDA 2023 Verified
Growing Season
100-130 days
Winter Minimum
-35°F to -30°F
(-37.2°C to -34.4°C)
AHS Heat Zone 1-4
Less than 1 heat day per year • Minimal heat stress
Typical regions: Northern Great Plains, Upper Midwest, Northern New England mountains
📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Last verified: 1/22/2026
✓ Zone Compatibility Analysis
medium confidenceTight fit: 120 days to maturity in 130-day season (10 days buffer).
Recommendation: Start seeds indoors 4-6 weeks early. Use row covers for season extension.
💾 Suitability computed by Solara Agricultural Intelligence Platform
📅 Zone 3b Planting Calendar for IR64
🌱 Start Seeds Indoors
March 12
✓ Database-computed optimal date
🪴 Transplant Outdoors
April 30
✓ Database-computed optimal date
🌾 Direct Sow (Alternative)
2 weeks after last frost
For warm-season crops
🥕 Expected Harvest
August 28
💡 Zone 3b Growing Tips
- • Growing season: 100-130 frost-free days
- • Start indoors for best results to maximize your growing season
- • Monitor soil temperature before transplanting (minimum 55-60°F for most crops)
⚠️ Zone 3b Challenges
⚠️Cold winters
⚠️Variable spring weather
⚠️Wind exposure
✅ Best Plants for Zone 3b
✓Hardy vegetables
✓Apples
✓Cherries
✓Lilacs
✓Hostas
❄️ Winter in Zone 3b
Cold winters with temperatures reaching -30°F to -35°F.
☀️ Summer in Zone 3b
Warm summers suitable for most cool-season crops.
🔥 Heat Management for AHS Zone 1-4
This zone experiences less than 1 heat day per year with minimal heat stress.
🌡️No heat protection needed
🌡️Focus on cold hardiness
Source: American Horticultural Society
📊 IR64 Quick Facts
Days to Maturity
90-150
Difficulty
—
Season
—
Type
OP
📍 View IR64 Guide for Other Zones
Free Zone 3b Planting Calendar
Get IR64 planting dates, frost alerts, and succession timing for your zone — delivered to your inbox.
Get Personalized IR64 Planting Dates
Enter your exact location for custom frost dates, planting windows, and harvest predictions tailored to your microclimate.
Try Solara Free →